广东及其邻域的地壳厚度和泊松比分布
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摘要
利用广东及其邻域福建、江西、湖南、广西、海南、台湾共82个宽频带数字地震台的远震资料,计算获得了所有台站下方的体波接收函数,并通过接收函数H-κ搜索叠加方法反演了这些台站下方的地壳厚度和平均泊松比。研究结果表明,广东及其周边地区的地壳厚度为26.8～33.6km,平均为29.5km。由西北到东南逐渐变薄,表现出大陆地壳向大洋地壳的缓慢过渡过程。珠江三角洲、粤西、粤桂琼交界、广西南宁、广东南澳等地区地壳厚度较薄,为25.0～28.0km;海南的翁田、广东的湛江、上川岛等地壳厚度最薄,在26km左右;福建明溪、湖南永州周边地区地壳厚度较厚,为31.0～34.0km。研究区域内地壳泊松比为0.20～0.29,海南岛的东南部、粤东和闽西的沿海地区以及江西南部具有明显的高泊松比,这可能与这些地区具有广泛的温泉分布和高热流值的特性有关。地壳厚度和泊松比分布的分块特征明显,并与断层和历史地震的分布有关。
Base on the teleseismic waveform data recorded by 82 permanent broadband stations in Guangdong Province and its adjacent areas including in Fujian,Jiangxi,Hunan,Guangxi,Hainan,and Taiwan,we calculated body wave receiver functions under all stations,and obtained the crustal thickness and averaged Poisson's ratio beneath these stations by the H-κ stacking-search method of receiver function.The results show the crustal thickness with an average thickness of 29.5km in Guangdong Province and its adjacent areas ranges between 26.8km and 33.6km and gradually thins from Northwest to Southeast.The crustal thickness in Zhujiang Delta,western Guangdong,Nanning,and Nanao areas is relatively thinner and ranges between 25.0km and 28.0km.The minimum crustal thickness is about 26km beneath the Wengtian of Hainan and the Zhanjiang zone and Shangchuan Island of Guangdong.The crustal thickness in the zones of Mingxi,Fujian and Yongzhou,Hunan is thicker and varies between 31.0 km and 34.0 km.The distribution of Poisson's ratio in our study region ranges between 0.20 and 0.29.Poisson's ratio in southeast Hainan,the coastal areas of eastern Guangdong and western Fujian and southern Jiangxi has distinctly higher values than that in others.It suggests that the various geothermal fields are just located in these areas which have high heat flow values.The distribution of crustal thickness and Poisson's ratio have obvious block features and may be related to the distribution of faults and historical earthquakes.
Base on the teleseismic waveform data recorded by 82 permanent broadband stations in Guangdong Province and its adjacent areas including in Fujian,Jiangxi,Hunan,Guangxi,Hainan,and Taiwan,we calculated body wave receiver functions under all stations,and obtained the crustal thickness and averaged Poisson's ratio beneath these stations by the H-κ stacking-search method of receiver function.The results show the crustal thickness with an average thickness of 29.5km in Guangdong Province and its adjacent areas ranges between 26.8km and 33.6km and gradually thins from Northwest to Southeast.The crustal thickness in Zhujiang Delta,western Guangdong,Nanning,and Nanao areas is relatively thinner and ranges between 25.0km and 28.0km.The minimum crustal thickness is about 26km beneath the Wengtian of Hainan and the Zhanjiang zone and Shangchuan Island of Guangdong.The crustal thickness in the zones of Mingxi,Fujian and Yongzhou,Hunan is thicker and varies between 31.0 km and 34.0 km.The distribution of Poisson's ratio in our study region ranges between 0.20 and 0.29.Poisson's ratio in southeast Hainan,the coastal areas of eastern Guangdong and western Fujian and southern Jiangxi has distinctly higher values than that in others.It suggests that the various geothermal fields are just located in these areas which have high heat flow values.The distribution of crustal thickness and Poisson's ratio have obvious block features and may be related to the distribution of faults and historical earthquakes.
引文
陈恩民等编,2007,广东沿海及邻侧地带的强烈地震与区域断裂构造特征和发震构造,北京:世界文献出版社。
邓起东,2007,中国活动构造图,北京:地震出版社。
胡家富、朱雄关、夏静瑜等,2005,用面波和接收函数联合反演滇西地区壳幔速度结构,地球物理学报,48(5),1069～1076。
黄晖、米宁、徐呜洁等,2010,福建地区地壳上地幔S波速度结构与泊松比,高校地质学报,16(4),465～474。
黄建平、崇加军、倪四道,2008,利用H-Kappa方法反演中国地区台站下地壳厚度,中国科学技求大学学报,38(1),33～40。
刘启元、李顺成、沈杨等,1997,中国数字地震台网的接收函数及其非线性反演,地球物理学报,40(3),356～368。
刘启元、Rainer Kind、李顺成,1996,接收函数复谱比的最大或然性估计及非线性反演,地球物理学报,39(4),502～511。
沈旭章、周蕙兰,2009,接收函数CCP-PWS偏移方法探测中国东北地区620km深处低速层,科学通报,54(2),215～223。
孙丽、刘瑞丰、黄志斌等,2008,用接收函数研究川滇地区国家地震台下地壳厚度及波速比,中国地震,24(4),362～369。
王峻、刘启元、陈九辉等,2009,首都圈地区的地壳厚度及泊松比,地球物理学报,52(1),57～66。
魏柏林、冯绚敏、陈定国等,2001,东南沿海地震活动特征,北京:地震出版社。
吴庆举、田小波、张乃铃等,2003,用Wiener滤波方法提取台站接收函数,中国地震,19(1),41～47。
吴庆举、李永华、张瑞青等,2007a,接收函数的克希霍夫2D偏移方法,地球物理学报,50(2),539～545。
吴庆举、李永华、张瑞青等,2007b,用多道反褶积方法测定台站接收函数,地球物理学报,50(3),791～796。
吴庆举、曾融生,1998,用宽频带远震接收函数研究青藏高原的地壳结构,地球物理学报,41(5),669～679.
夏少红、丘学林、赵明辉等,2010,南海北部海陆过度带地壳平均速度及莫霍面深度分析,热带海洋学报,29(4),63～70。
熊绍柏、金东敏、孙克忠等,1991,福建漳州地热田及其邻近地区的地壳深部构造特征,地球物理学报,34(1),55～63。
熊小松、高锐、李秋生等,2009,深地震探测揭示华南地区莫霍面深度,地球学报,30(6),774～786。
徐强、赵俊猛,2008,接收函数方法的研究综述,地球物理学进展,23(6),1709～1716。
许卫卫、郑天愉、赵亮,2011,华北地区410km间断面和660km间断面结构-克拉通活化的地幔动力学状态探测,中国科学:地球科学,41(5),678～685。
闫雅芬、王光杰、张中杰等,2004,中国华南大陆重力场特征及其大地构造意义,地质学报,78(6),828。
杨中书、崇加军、倪四道等,2010,利用远震下方接收函数研究江西省地震台站莫霍面深度及泊松比分布,华南地震,30(1),47～55。
姚伯初、曾维军、陈艺中等,1994,南海北部陆缘东部的地壳结构,地球物理学报,37(1),27～35。
尹周勋、赖明惠、熊绍柏等,1999,华南连县-博罗-港口地带地壳结构及速度分布的爆炸地震探测结果,地球物理学报,42(3),383～392。
袁丽文、郑斯华,2009,用远震接收函数反演福建地区宽频带台站下方莫霍界面深度,华南地震,29(3),85～97。
赵明辉、丘学林、徐辉龙等,2007,南海北部沉积层和地壳内低速层的分布和识别,自然科学进展,17(4),471～479。
郑圻森、朱介寿、宣瑞卿等,2003,华南地区地壳速度结构分析,沉积与特提斯地质,23(4),9～13。
Christensen N I,Fountain D M,1975,Constitution of the lower continental crust based on experimental studies of seismic velocitiesin granulite,Geological Society of America Bulletin,86(2),227～236.
Fountain D M,Christensen N I,1989,Composition of the continental crust and upper mantle:a review in geophysical framework ofthe continental United States,Mem Geol Soc Am,172,711～742.
Herrmann R B,Ammon C J,2009,Computer Programs in Seismology;Version3.30,Saint Louis University.
Juan P L,Charles J A,1999,Iterative deconvolution and receiver-function estimation,Bulletin of the Seismological Society ofAmerica,89(5),1395～1400.
JuliàJ,Ammon C J,Herrmann R B,et al,2000,Joint inversion of receiver function and surface wave dispersion observations,Geophys J Int,143,99～112.
Langston C A,Corcallis,Oregon,1977,Crustal and upper mantle structure from teleseismic P and S wave,Bull Seism Soc Am,67,713～724.
Liu Q Y,Li Y,Chen J H,et al,2010,Joint inversion of receiver function and ambient noise based on Bayesian theory,ChineseJournal Geophysics,53(11),2603～2612.
Yuan X,Ni J,Kind R,et al,1997,Lithospheric and upper mantle structure of southern Tibet from a seismological passive sourceexperiment,J Geophys Res,102(B12),27491～27500.
Zhu L P,Kanamor I,2000,Moho depth variation in southern California from teleseismic receiver functions,J Geophys Res,105(B2),2969～2980.
邓起东,2007,中国活动构造图,北京:地震出版社。
胡家富、朱雄关、夏静瑜等,2005,用面波和接收函数联合反演滇西地区壳幔速度结构,地球物理学报,48(5),1069～1076。
黄晖、米宁、徐呜洁等,2010,福建地区地壳上地幔S波速度结构与泊松比,高校地质学报,16(4),465～474。
黄建平、崇加军、倪四道,2008,利用H-Kappa方法反演中国地区台站下地壳厚度,中国科学技求大学学报,38(1),33～40。
刘启元、李顺成、沈杨等,1997,中国数字地震台网的接收函数及其非线性反演,地球物理学报,40(3),356～368。
刘启元、Rainer Kind、李顺成,1996,接收函数复谱比的最大或然性估计及非线性反演,地球物理学报,39(4),502～511。
沈旭章、周蕙兰,2009,接收函数CCP-PWS偏移方法探测中国东北地区620km深处低速层,科学通报,54(2),215～223。
孙丽、刘瑞丰、黄志斌等,2008,用接收函数研究川滇地区国家地震台下地壳厚度及波速比,中国地震,24(4),362～369。
王峻、刘启元、陈九辉等,2009,首都圈地区的地壳厚度及泊松比,地球物理学报,52(1),57～66。
魏柏林、冯绚敏、陈定国等,2001,东南沿海地震活动特征,北京:地震出版社。
吴庆举、田小波、张乃铃等,2003,用Wiener滤波方法提取台站接收函数,中国地震,19(1),41～47。
吴庆举、李永华、张瑞青等,2007a,接收函数的克希霍夫2D偏移方法,地球物理学报,50(2),539～545。
吴庆举、李永华、张瑞青等,2007b,用多道反褶积方法测定台站接收函数,地球物理学报,50(3),791～796。
吴庆举、曾融生,1998,用宽频带远震接收函数研究青藏高原的地壳结构,地球物理学报,41(5),669～679.
夏少红、丘学林、赵明辉等,2010,南海北部海陆过度带地壳平均速度及莫霍面深度分析,热带海洋学报,29(4),63～70。
熊绍柏、金东敏、孙克忠等,1991,福建漳州地热田及其邻近地区的地壳深部构造特征,地球物理学报,34(1),55～63。
熊小松、高锐、李秋生等,2009,深地震探测揭示华南地区莫霍面深度,地球学报,30(6),774～786。
徐强、赵俊猛,2008,接收函数方法的研究综述,地球物理学进展,23(6),1709～1716。
许卫卫、郑天愉、赵亮,2011,华北地区410km间断面和660km间断面结构-克拉通活化的地幔动力学状态探测,中国科学:地球科学,41(5),678～685。
闫雅芬、王光杰、张中杰等,2004,中国华南大陆重力场特征及其大地构造意义,地质学报,78(6),828。
杨中书、崇加军、倪四道等,2010,利用远震下方接收函数研究江西省地震台站莫霍面深度及泊松比分布,华南地震,30(1),47～55。
姚伯初、曾维军、陈艺中等,1994,南海北部陆缘东部的地壳结构,地球物理学报,37(1),27～35。
尹周勋、赖明惠、熊绍柏等,1999,华南连县-博罗-港口地带地壳结构及速度分布的爆炸地震探测结果,地球物理学报,42(3),383～392。
袁丽文、郑斯华,2009,用远震接收函数反演福建地区宽频带台站下方莫霍界面深度,华南地震,29(3),85～97。
赵明辉、丘学林、徐辉龙等,2007,南海北部沉积层和地壳内低速层的分布和识别,自然科学进展,17(4),471～479。
郑圻森、朱介寿、宣瑞卿等,2003,华南地区地壳速度结构分析,沉积与特提斯地质,23(4),9～13。
Christensen N I,Fountain D M,1975,Constitution of the lower continental crust based on experimental studies of seismic velocitiesin granulite,Geological Society of America Bulletin,86(2),227～236.
Fountain D M,Christensen N I,1989,Composition of the continental crust and upper mantle:a review in geophysical framework ofthe continental United States,Mem Geol Soc Am,172,711～742.
Herrmann R B,Ammon C J,2009,Computer Programs in Seismology;Version3.30,Saint Louis University.
Juan P L,Charles J A,1999,Iterative deconvolution and receiver-function estimation,Bulletin of the Seismological Society ofAmerica,89(5),1395～1400.
JuliàJ,Ammon C J,Herrmann R B,et al,2000,Joint inversion of receiver function and surface wave dispersion observations,Geophys J Int,143,99～112.
Langston C A,Corcallis,Oregon,1977,Crustal and upper mantle structure from teleseismic P and S wave,Bull Seism Soc Am,67,713～724.
Liu Q Y,Li Y,Chen J H,et al,2010,Joint inversion of receiver function and ambient noise based on Bayesian theory,ChineseJournal Geophysics,53(11),2603～2612.
Yuan X,Ni J,Kind R,et al,1997,Lithospheric and upper mantle structure of southern Tibet from a seismological passive sourceexperiment,J Geophys Res,102(B12),27491～27500.
Zhu L P,Kanamor I,2000,Moho depth variation in southern California from teleseismic receiver functions,J Geophys Res,105(B2),2969～2980.
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